Wow, sorry to hear about the medical scare but glad you are doing well! It's nice that your XW does at least care, I have no doubt it was genuine. My XW is the same, doesn't mean she wants to get back with me but she does care and asks questions about my health sometimes (if I'm sick or something), offers to help and shows interest.
Have a good time in Greece! I've never been, it's on my bucket list!